James Wycliffe Headlam, 1911 Encyclopædia Britannica, Volume 16… (1911)
“ He had been brought to the notice of the political world by some articles he wrote from 1861 to 1864, which were afterwards published under the title Zur Verfassungsgeschichte Preussens (Leipzig, 1874) , and in 1865 he was elected member for one of the divisions of Berlin in the Prussian parliament. He joined the radical or Fortschritts party, and in 1867 was also elected to the German parliament, but he helped to form the national liberal party, and in consequence lost his seat in Berlin, which remained faithful to the radicals ”
